Induction hob device and a method for operating an induction hob device

Abstract

An induction hob device includes at least one cooktop, at least one first coil, at least one second coil, and a control unit. The first coil and the second coil are displaced relative to each other at least in a direction perpendicular to the cooktop. In order to improve an efficiency, the control unit is configured to at least temporarily operate the first coil and the second coil simultaneously.

Claims

1. An induction hob device, comprising: a cooktop having a main extension plane; a first coil and a second coil disposed below the cooktop, the first coil being displaced relative to the second coil at least in a direction perpendicular to the main extension plane of the cooktop; and a control unit configured to at least temporarily operate the first and second coils simultaneously, wherein, when an outermost border of the first coil is offset from an outermost border of the second coil in the direction perpendicular to the main extension plane of the cooktop such that the first and second coils only partially overlap each other.

2. The induction hob device of claim 1, wherein the first and second coils are located directly adjacent relative to each other.

3. The induction hob device of claim 1, wherein the first and second coils are electrically connected.

4. The induction hob device of claim 1, further comprising a third coil which is displaced relative to the first and second coils at least in the direction perpendicular to the main extension plane of the cooktop, said control unit being configured to at least temporarily operate the third coil simultaneously with the first and second coils.

5. The induction hob device of claim 4, wherein, when the first and second coils are viewed from above the cooktop in the direction perpendicular to the main extension plane of the cooktop, an outermost border of the third coil is offset from at least one of the outermost borders of the first and second coils.

6. The induction hob device of claim 4, wherein the third coil and at least one of the first and second coils are electrically connected.

7. The induction hob device of claim 1, wherein the first and second coils at least partly form an inductor.

8. The induction hob device of claim 7, further comprising a further inductor which is substantially identical to the inductor, wherein the inductor and the further inductor comprise an at least substantially equal effective distance to the cooktop.

9. The induction hob device of claim 8, wherein the inductor and the further inductor interleave each other.

10. The induction hob device of claim 1, wherein the first and second coils are located directly adjacent relative to each other in the direction perpendicular to the main extension plane of the cooktop and not spaced apart in the direction perpendicular to the main extension plane of the cooktop.

11. The induction hob device of claim 1, wherein the first coil includes at least one winding and the second coil includes at least one winding, and wherein, when the first and second coils are viewed from above the cooktop in the direction perpendicular to the main extension plane of the cooktop, an outermost border of the at least one winding of the first coil is offset from an outermost border of the at least one winding of the second coil.

12. The induction hob device of claim 1, wherein the first coil includes a plurality of windings and the second coil includes a plurality of windings, and wherein, when the first and second coils are viewed from above the cooktop in the direction perpendicular to the main extension plane of the cooktop, an outermost border of the plurality of windings of the first coil is offset from an outermost border of the plurality of windings of the second coil.

13. The induction hob device of claim 1, wherein the first and second coils only partly overlap each other when viewed in the direction perpendicular to the main extension plane of the cooktop, and an overlapping area between the first coil and the second coil is at least one of equal to and less than 45% of a total surface area of one of the first and second coils.

14. The induction hob device of claim 1, wherein the first and second coils only partly overlap each other when viewed in the direction perpendicular to the main extension plane of the cooktop, and an overlapping area between the first coil and the second coil is substantially 30% of a total surface area of one of the first and second coils.

15. An induction hob, comprising an induction hob device, said induction hob device comprising a cooktop having a main extension plane, a first coil and a second coil disposed below the cooktop, the first coil being displaced relative to the second coil at least in a direction perpendicular to the main extension plane of the cooktop, and a control unit configured to at least temporarily operate the first and second coils simultaneously, wherein, when an outermost border of the first coil is offset from an outermost border of the second coil in the direction perpendicular to the main extension plane of the cooktop such that the first and second coil partially overlap each other.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) It is shown in:

(2) FIG. 1 a simplified schematic top view of an induction hob comprising an induction hob device having a cooktop and several inductors,

(3) FIG. 2 an enlarged view of the inductors,

(4) FIG. 3 a simplified schematic top view of one inductor of the inductors,

(5) FIG. 4 a simplified schematic side view of the inductor,

(6) FIG. 5 a simplified schematic side view of the inductor and an at least substantially identical further inductor of the inductors,

(7) FIG. 6 a simplified schematic side view of an inductor of a further induction hob device,

(8) FIG. 7 a simplified schematic side view of the inductor of FIG. 6 and an at least substantially identical further inductor,

(9) FIG. 8 a simplified schematic top view of the inductors of FIG. 7,

(10) FIG. 9 a simplified schematic side view of an inductor of a further induction hob device and

(11) FIG. 10 a simplified perspective view of an inductor of a further induction hob device.

DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS OF THE PRESENT INVENTION

(12) FIG. 1 shows a top view of an exemplary induction hob 24a. In the present case, the induction hob 24a is formed as a matrix-hob and/or a flexible hob. The induction hob 24a comprises an induction hob device. The induction hob device comprises a cooktop 10a. The cooktop 10a is adjustable and comprises flexible and/or changeable heating zones. The cooktop 10a and/or heating zones are provided to heat at least one cooking utensil 26a.

(13) The induction hob device further comprises an operating interface 28a. The operating interface 28a is provided for controlling an operation of the induction hob 24a and/or the induction hob device, in particular by entering and/or choosing at least one parameter like a heating power, a heating density, a heating stage and/or a heating zone.

(14) Moreover, the induction hob device comprises a control unit 18a. The control unit 18a comprises a processor unit, a memory unit and an operating program which is stored in the memory unit and executed by the processor unit. The control unit 18a is provided for controlling a cooking process.

(15) The induction hob device further comprises at least one inductor 20a, 22a. In the present case, the induction hob device comprises a plurality of inductors 20a, 22a, here in particular between 12 and 48 inductors 20a, 22a, wherein for simplicity, in particular, in FIGS. 1 and 2 merely two of the inductors 20a, 22a are provided with reference numbers. The inductors 20a, 22a are located below the cooktop 10a. The inductors 20a, 22a correspond to heating units. The inductors 20a, 22a are at least substantially identical. The inductors 20a, 22a are arranged in such a way that the inductors 20a, 22a comprise an equal effective distance to the cooktop 10a. The inductors 20a, 22a are provided to create the, in particular flexible, heating zones. The inductors 20a, 22a are provided for generating an alternating electromagnetic field, which is converted into heat in a bottom of the cooking utensil 26a by means of eddy currents and/or magnetization and demagnetization effects. As an alternative, it is conceivable that an induction hob device comprises two, four and/or six, in particular non-flexible, heating zones and/or two, four and/or six inductors, wherein each inductor is assigned to one of the heating zones.

(16) In the following with respect to FIGS. 3 and 4 merely one inductor 20a of the inductors 20a, 22a is described in more detail. Thereby, the following description can also be applied to the further inductors 22a of the inductors 20a, 22a, in particular due to the at least substantially identical construction of the inductors 20a, 22a.

(17) The inductor 20a comprises a first coil 12a. The first coil 12a is formed as a spiral coil. The first coil 12a is at least substantially circular at least when seen in a direction perpendicular to a main extension plane of the cooktop 10a. The first coil 12a comprises fifteen windings in one layer. The first coil 12a is located directly adjacent to the cooktop 10a. As an alternative, it is conceivable that a first coil comprises an arbitrary other number of windings and/or layers. Thereby, a first coil might be formed as a solenoid and/or an elliptic coil. Moreover, the inductor 20a comprises a second coil 14a. The second coil 14a is formed as a spiral coil. The second coil 14a is at least substantially circular at least when seen in the direction perpendicular to the main extension plane of the cooktop 10a. The second coil 14a comprises fifteen windings in one layer. The second coil 14a is at least substantially identical to the first coil 12a. The second coil 14a is displaced relative to the first coil 12a at least in a direction perpendicular to the cooktop 10a. The second coil 14a is located below the first coil 12a in particular with respect to the cooktop 10a. Thereby, the second coil 14a is located directly adjacent to the first coil 12a, in particular at least when seen in the direction perpendicular and parallel to the main extension plane of the cooktop 10a.

(18) Moreover, the second coil 14a is substantially displaced relative to the first coil 12a at least in a direction parallel to the cooktop 10a. The second coil 14a is thereby arranged with respect to the first coil 12a in such a way that a geometric center of the second coil 14a is distanced from an outer border of the first coil 12a at least when seen in the direction perpendicular to the main extension plane of the cooktop 10a. Furthermore, the first coil 12a and the second coil 14a at least partly overlap at least when seen in the direction perpendicular to the main extension plane of the cooktop 10a. In the present case, an overlapping area between the first coil 12a and the second coil 14a amounts to about 30% of a total surface area of the first coil 12a or the second coil 14a at least when seen in the direction perpendicular to the main extension plane of the cooktop 10a.

(19) In the present case, the first coil 12a and the second coil 14a are additionally electrically connected. Thereby, the first coil 12a and the second coil 14a are connected in series. As an alternative, it is conceivable that a first coil and a second coil are connected in parallel or are not connected. Thereby, it is also conceivable that a second coil is part of another inductor. Moreover, it is conceivable that a second coil comprises an arbitrary other number of windings and/or layers. Furthermore, a second coil might be formed as a solenoid and/or an elliptic coil. Additionally, it is conceivable that a second coil is flipped and/or mirrored relative to a first coil, in particular with respect to a plane which is parallel to a main extension plane of a cooktop.

(20) Moreover, the inductor 20a comprises a third coil 16a. The third coil 16a is formed as a spiral coil. The third coil 16a is at least substantially circular at least when seen in the direction perpendicular to the main extension plane of the cooktop 10a. The third coil 16a comprises fifteen windings in one layer. The third coil 16a is at least substantially identical to the first coil 12a and the second coil 14a. The third coil 16a is displaced relative to the first coil 12a at least in a direction perpendicular to the cooktop 10a. In addition, the third coil 16a is displaced relative to the second coil 14a at least in a direction perpendicular to the cooktop 10a. The third coil 16a is located below the first coil 12a in particular with respect to the cooktop 10a. Moreover, the third coil 16a is located below the second coil 14a in particular with respect to the cooktop 10a. Thereby, the third coil 16a is located directly adjacent to the second coil 14a, in particular at least when seen in the direction perpendicular and parallel to the main extension plane of the cooktop 10a.

(21) Moreover, the third coil 16a is substantially displaced relative to the first coil 12a at least in a direction parallel to the cooktop 10a. The third coil 16a is thereby arranged with respect to the first coil 12a in such a way that a geometric center of the third coil 16a is distanced from an outer border of the first coil 12a at least when seen in the direction perpendicular to the main extension plane of the cooktop 10a. In addition, the third coil 16a is substantially displaced relative to the second coil 14a at least in a direction parallel to the cooktop 10a. The third coil 16a is thereby arranged with respect to the second coil 14a in such a way that a geometric center of the third coil 16a is distanced from an outer border of the second coil 14a at least when seen in the direction perpendicular to the main extension plane of the cooktop 10a.

(22) Furthermore, the first coil 12a and the third coil 16a at least partly overlap at least when seen in the direction perpendicular to the main extension plane of the cooktop 10a. In the present case, an overlapping area between the first coil 12a and the third coil 16a amounts to about 30% of a total surface area of the first coil 12a or the third coil 16a at least when seen in the direction perpendicular to the main extension plane of the cooktop 10a. In addition, the second coil 14a and the third coil 16a at least partly overlap at least when seen in the direction perpendicular to the main extension plane of the cooktop 10a. In the present case, an overlapping area between the second coil 14a and the third coil 16a amounts to about 30% of a total surface area of the second coil 14a or the third coil 16a at least when seen in the direction perpendicular to the main extension plane of the cooktop 10a.

(23) Besides, the first coil 12a, the second coil 14a and the third coil 16a are electrically connected. Thereby, the first coil 12a, the second coil 14a and the third coil 16a are connected in series and in particular form the inductor 20a. As an alternative, it is conceivable that a first coil and a third coil and/or a second coil and a third coil are connected in parallel or are not connected. Thereby, it is also conceivable that a third coil is part of another inductor. Moreover, it is conceivable that a third coil comprises an arbitrary other number of windings and/or layers. Furthermore, a third coil might be formed as a solenoid and/or an elliptic coil. Additionally, it is conceivable that a third coil is flipped and/or mirrored relative to a first coil or a second coil, in particular with respect to a plane which is parallel to a main extension plane of a cooktop. Besides, it is also conceivable to refrain from using a third coil, so that an inductor is formed merely by a first coil and a second coil.

(24) The control unit 18a is provided for controlling a cooking process by regulating a heating output of the inductor 20a and/or the inductors 20a, 22a, in particular by activating a power supply (not shown). Consequently, the control unit 18a is provided to operate the first coil 12a, the second coil 14a and the third coil 16a simultaneously. As a result, a uniform thermal distribution in the cooking utensil 26a can be achieved, wherein an effective diameter of the inductor 20a can be increased while keeping a distance between centers of the coils 12a, 14a, 16a constant. As an alternative, it is conceivable to supply coils with different power supplies of a power supply unit. Moreover, at least for the purpose of improving an efficiency of the induction hob 24a, the control unit 18a is provided to merely operate the inductors 20a, 22a which are located at least partly below the cooking utensil 26a.

(25) FIG. 5 shows the inductor 20a and an at least substantially identical further inductor 22a of the inductors 20a, 22a. The further inductor 22a is directly adjacent to the inductor 20a at least when seen in the direction perpendicular and parallel to the main extension plane of the cooktop 10a. The inductor 20a and the further inductor 22a are arranged in such a way that the inductor 20a and the further inductor 22a comprise an equal effective distance to the cooktop 10a, which in particular results in a particularly uniform heat distribution and/or thermal distribution, in particular in the cooking utensil 26a. In the present case, the effective distance to the cooktop 10a is between 3 mm and 15 mm.

(26) Moreover, the inductor 20a and the further inductor 22a are arranged in such a way that the inductor 20a and the further inductor 22a interleave each other. Thereby, a further second coil 15a of the further inductor 22a, which is in particular located between a further first coil 13a of the further inductor 22a and a further third coil 17a of the further inductor 22a and is in particular equal to the second coil 14a, is at least partly located between the first coil 12a and the third coil 16a at least when seen in the direction perpendicular and/or parallel to the main extension plane of the cooktop 10a. Hence, at least one line exists which is perpendicular to the main extension plane of the cooktop 10a and intersects the inductor 20a and the further inductor 22a at least when seen in the direction perpendicular to the cooktop 10a. By overlapping the inductors 20a, 22a a coverage resolution and by that in particular a flexibility of the induction hob 24a can be advantageously improved which leads to a particularly uniform power distribution. In the present case, the inductors 20a, 22a are moreover supplied using the same power supply. As an alternative, it is also conceivable to supply different inductors, in particular directly adjacent inductors, using different power supplies and/or different phases of a power supply by which advantageously magnetic interferences and/or magnetic disturbances can be effectively reduced.

(27) The FIGS. 6 to 10 show further exemplary embodiments of the invention. The description below and the figures are at least substantially limited to the differences between the exemplary embodiments. Regarding components that are designated in the same way, particularly regarding components having identical reference numerals, reference can be made to the figures and/or the description of the other exemplary embodiment, especially of FIGS. 1 to 5. In order to differentiate the exemplary embodiments, the letter a is added after the reference numerals of the exemplary embodiment in FIGS. 1 to 5. In the exemplary embodiments of FIGS. 6 to 10, the letter a is replaced by the letters b to d.

(28) The FIGS. 6 to 8 show one further embodiment of the invention. The letter b is postposed to the reference numbers of the further embodiment of the FIGS. 6 to 8. The further embodiment of the FIGS. 6 to 8 differs from the previous embodiment at least substantially by a construction of inductors 20b, 22b of an induction hob device.

(29) In the present case each inductor 20b, 22b comprises exactly two coils 12b, 13b, 14b, 15b. A first coil 12b, a second coil 14b, a further first coil 13b and a further second coil 15b are at least substantially semicircular at least when seen in a direction perpendicular to a main extension plane of a cooktop 10b. Thereby, the first coil 12b and the second coil 14b are distanced from each other at least when seen in the direction perpendicular to the main extension plane of the cooktop 10b. Hence, the first coil 12b and the second coil 14b do not overlap. Moreover, the further first coil 13b and the further second coil 15b are distanced from each other at least when seen in the direction perpendicular to the main extension plane of the cooktop 10b. Hence, the further first coil 13b and the further second coil 15b do not overlap.

(30) Thereby, the inductor 20b and the further inductor 22b are mirror-symmetrically, in particular with respect to a plane which is perpendicular to the main extension plane of the cooktop 10b.

(31) As it can be seen from FIG. 8, the inductor 20b and the further inductor 22b comprise an at least substantially interdigitated shape.

(32) FIG. 9 shows one further embodiment of the invention. The letter c is postposed to the reference numbers of the further embodiment of FIG. 9. The further embodiment of FIG. 9 differs from the previous embodiments at least substantially by a construction of inductors 20c, 22c of an induction hob device.

(33) In the present case each inductor 20c, 22c comprises exactly two coils 12c, 13c, 14c, 15c. A first coil 12c and a further second coil 15c are at least substantially identical. Thereby, the first coil 12c and the further second coil 15c are at least substantially circular at least when seen in a direction perpendicular to a main extension plane of a cooktop 10c. Moreover, a second coil 14c and a further first coil 13c are at least substantially identical. The second coil 14c and the further first coil 13c are at least substantially semicircular at least when seen in a direction perpendicular to a main extension plane of a cooktop 10c.

(34) In addition, the second coil 14c is arranged in such a way that the first coil 12c completely covers the second coil 14c at least when seen in the direction perpendicular to the main extension plane of the cooktop 10c. Moreover, the further second coil 15c is arranged in such a way that the further first coil 13c at least partly covers the further second coil 15c at least when seen in the direction perpendicular to the main extension plane of the cooktop 10c.

(35) Thereby, the inductor 20c and the further inductor 22c are rotationally symmetric, in particular with respect to a plane which is parallel to the main extension plane of the cooktop 10c.

(36) The first coil 12c and the further second coil 15c thereby at least partly overlap at least when seen in the direction perpendicular to the main extension plane of the cooktop 10c. In the present case, an overlapping area between the first coil 12c and the further second coil 15c amounts to about 30% of a total surface area of the first coil 12c or the further second coil 15c at least when seen in the direction perpendicular to the main extension plane of the cooktop 10c.

(37) FIG. 10 shows one further embodiment of the invention. The letter d is postposed to the reference numbers of the further embodiment of FIG. 10. The further embodiment of FIG. 10 differs from the previous embodiments at least substantially by a construction of inductors 20d, 22d of an induction hob device.

(38) In the present case, the inductors 20d, 22d are embodied as vector coils. Thereby, at least a first coil 12d, a second coil 14d, a further first coil 13d and a further second coil 15d are at least partly oval and/or elliptic at least when seen in a direction perpendicular to a main extension plane of a cooktop 10d.